Characterization of hydromechanical stress in aerated stirred tanks up to 40 m3 scale by measurement of maximum stable drop size

Table 2 Geometrical details of the reactors used, geometrical details of impeller configurations and ranges of turbulence parameters

Geometrical details of reactors								Geometrical details of impellers							Turbulence parameters
Reactor configuration	Nominal reactor size	D_R	V_L	H	Number of impellers	C	ΔC	d	h	w	d/D_R	h/d	w/d	Po	n	Re	λ	λ/Λ	d_max/λ	Λ/d_max
		m						m	m	m	-	-	-	-	1/s	-	μm	-	-	-
A-1	50 L	0.293	0.035	0.52	3	0.095	0.19	0.104	0.023	0.029	0.35	0.22	0.28	5.5	4.0 – 11.7	4.3 – 12∙10⁴	16 – 32	286 – 571	14 – 28	11 – 39
A-2								0.15	0.05	0.05	0.51	0.33	0.33	8	3.6 – 8.0	8.1 – 18∙10⁴	13 – 23	400 – 688	17 – 21	19 – 40
A-3								0.17	0.05	0.05	0.58	0.29	0.29	7.1	3.3 – 7.2	9.6 – 21∙10⁴	14 – 23	402 – 674	17 – 21	19 – 39
A-4								0.19	0.05	0.05	0.65	0.26	0.26	6.4	2.8 – 6.1	1.0 – 2.2∙10⁵	13 – 23	396 – 695	17 – 21	19 – 42
B-1	3 m³	1.2	2.4^a	2.2	3	0.51	0.69	0.41	0.09	0.12	0.34	0.22	0.28	4.9	2.1 - 5.8	2.5 – 9.7∙10⁵	11 – 23	1.5 – 3.2∙10³	14 – 23	71 – 211
B-2								0.45	0.09	0.12	0.38	0.2	0.26	5	1.9 – 5.1	3.7 – 10∙10⁵	11 – 23	1.5 – 3.2∙10³	15 – 26	64 – 185
B-3								0.51	0.12	0.18	0.43	0.24	0.34	5.9	1.3 – 4.2	2.6 – 11∙10⁵	11 – 25	1.9 – 4.4∙10³	15 – 24	82 – 261
C-1	40 m³	2.8	30	5	3	0.92	1.8	1.19	0.22	0.29	0.42	0.19	0.24	4.7	0.8 – 2.3	1.1 – 3.3∙10⁶	11 – 22	3.9 – 8.3∙10³	13 – 24	163 – 652

All impellers were 6-bladed Rushton type impellers installed in a three impeller configuration. Power numbers were estimated with Eq. 10, except for setup B-1 and B-3 for which Power numbers could be measured.
^afor 0.1 vvm aeration rate: 2.6 m³, see Daub et al. [24].

ISSN: 1754-1611